Dryer balls are great! They reduce drying time, save on electricity, are safe for cloth diapers and preserve the lifespan of your clothing. No chemicals, perfumes or dyes are used. Pure felted wool dryer balls absorb moisture in your dryer which helps maintain the humidity level. The balls bounce around creating air circulation between your clothing. The result is softer clothes that dried faster with less wrinkles and static cling. They eliminate the need for dryer sheets and fabric softeners. We recommend using 3 for a normal sized load and 6 for bulky items. Pure Wool Dryer Balls are excellent for fluffing up cloth diapers, down jackets, duvets, towels & blankets. They will not harm your clothing or your dryer & the wool does not rub off or unravel. There are no fillers, dyes, perfumes or chemicals, only pure wool. They last for 100+ loads..